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From: Chris Carlen
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Subject: Re: X-Rays in the garage?
References: <firstname.lastname@example.org> <3D9A3B2E.email@example.com> <3D9A4D61.32BCB5CC@webaccess.net>
Date: Wed, 02 Oct 2002 03:00:26 GMT
NNTP-Posting-Date: Tue, 01 Oct 2002 20:00:26 PDT
Chuck Simmons wrote:
>>I'd think one would have not too much trouble building an X ray tube, if
>>they had a decent vacuum cleaner.
> Too much air left for a filament to survive. An interesting vacuum pump
> can be made with bits of sheet metal. In this design, a fast stream of
> water passes through a small chamber to an outlet tube. The air is
> pumped out of the chamber. The vacuum that is attained is the vapor
> pressure of the water used for pumping. The vacuum can be moderately
> improved with a dry ice cold trap since most of the air is gon and
> replaced by water vapor. I believe that this is called an aspirator
> pump. Such pumps can be built with hand tools, a propane torch and some
> bits of metal including brass tubing, copper tubing, sheet brass or
> copper and solder.
:-D You took my vacuum cleaner suggestion literally, eh?
I like to say "vacuum cleaner" when I certainly mean a serious vacuum pump.
For a vacuum tube, I wonder if a 0.1 micron (10^-4 torr) two-stage
mechanical pump could suffice? But it may even be necessary to add a
diffusion or turbo pump onto that to get into the <10^-6 torr range.
Hopefully one day I will build another CO2 laser, this time at home. A
.1 micron pump works just fine for that. When I get a pump I can play
with other discharge and vacuum tube experiments.
Christopher R. Carlen
Suse 7.3 Linux 2.4.10
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